摘要:

SUMMARYBrown, J. L. 1979. Growth of nestling Grey-crowned Babblers, with notes on determination of age in juveniles. Emu 79: 1–6.Parameters of a curve describing growth of nestling Grey-crowned BabblersPomatostomus temporaliswere estimated by a new trial-and-error least-squares method with the aid of a computer from weights of fledgelings and nestlings. For a passerine of the temperate zone, growth rate and percentage of adult weight at fledging are unusually low and the nestling period is unusually long. These features are correlated with nest structure, mode of foraging, and perhaps with social organization. Criteria for determination of approximate age in juveniles were developed using banded wild birds. Criteria include colour and length of bill, colour of gape and characteristics of plumage.

ISSN:0158-4197    

DOI:10.1071/MU9790001

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYHolyoak, D. T. 1979. Notes on the birds of Viti Levu and Taveuni, Fiji. Emu 79: 7–18.Notes are given on the status and biology of Fijian birds based on visits to Viti Levu and Taveuni during 1973. Few Fijian landbirds are endangered and most of the endemic forms are still common. The flightless railNesoclopeus poecilopterusand the warblerTrichocichla rufa, both of which have been feared extinct since the last century, were rediscovered on Viti Levu. The Taveuni population ofPetroica multicoloris given a new subspecific name. It is suggested that recent reports of‘unknown’landbirds in Fiji may be based on misidentifications. Field notes on habitat preferences, diet, general behaviour and vocalizations are summarized for most of the species that were seen.

ISSN:0158-4197    

DOI:10.1071/MU9790007

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYJones, E., and I. J. Skira. 1979. Breeding distribution of the Great Skua at Macquarie Island in relation to numbers of rabbits. Emu 79: 19–23.During the 1974–75 summer at Macquarie Island the breeding success and distribution of Great SkuasStercorarius skuain relation to numbers of rabbits were studied on the plateau and the coastal terrace. On the plateau there was a strong correlation between the occurrence of rabbits and of nesting Skuas. On the coastal terrace, however, no such relation was found. The Skuas bred with similar success in both areas.Remains of food in Skuas' territories indicated that Skuas, nesting on the plateau, preyed heavily on rabbits from 200 to 1,200 grams in weight, with eighty-two per cent of rabbits eaten weighing less than 450 and ninety-eight per cent weighing less than 740 grams. Skuas, nesting on the terrace, in contrast, took few rabbits and depended largely on killing and scavenging on penguins and elephant seals. Present relations between predators and prey on the island are briefly discussed.

ISSN:0158-4197    

DOI:10.1071/MU9790019

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYSchodde, R. I. J. Mason and I. L. McKean. 1979. A new subspecies ofPhilemon buceroidesfrom Arnhem Land, Emu 79: 24–30.The taxonomic status and distribution of the two forms of the Helmeted FriarbirdPhilemon buceroidesin Arnhem Land are reviewed. The form occurring on the sandstone escarpments of western Arnhem Land differs from nearby coastal populations primarily in its larger size and from nominatebuceroidesof Timor in its vestigial casque; it is described as a new subspecies,P. b. ammitophila.Reasons are given for thinking thatammitophilaandgordoniarose from the same ancestor in northern Australia, rather than independently from ancestral populations of nominatebuceroidesin Timor.

ISSN:0158-4197    

DOI:10.1071/MU9790024

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

摘要:

SUMMARYBarton, D. 1979. Albatrosses in the western Tasman Sea. Emu 79: 31–35.Observations of albatrosses were made with recording of surface sea-water temperatures from a fishing trawler for a total of 2,822 daylight hours from 1 September 1976 to 31 March 1978. Eight species were observed. Wandering, Black-browed, Shy and Yellow-nosed Albatrosses were common and regular; their occurrence is quantified as average sightings per hour per month. Two forms of the Royal Albatross, the raceimpavidaof the Black-browed, Buller's and Grey-headed Albatrosses were less regular but were seen more often than expected from the literature. One Sooty Albatross was recorded.

ISSN:0158-4197    

DOI:10.1071/MU9790031

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790036

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790037

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790040

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790043b

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor

ISSN:0158-4197    

DOI:10.1071/MU9790044

出版商:Taylor&Francis    

年代:1979

数据来源: Taylor